Digitizing Printed Recipes with ChatGPT Vision

# number the output PDFs
outcount=1
for pdf_file in ...; do

    # Get the total number of pages in the PDF
    total_pages=$(gs -q -dNOSAFER -dNODISPLAY -c "($pdf_file) (r) file runpdfbegin pdfpagecount = quit")

    # Loop through the pages in steps of 2
    for ((first_page=1; first_page<=total_pages; first_page+=2)); do
        # Calculate the last page of the current pair
        last_page=$((first_page+1))
        # Output file name based on the page numbers
        output_file="$OUT_DIR/$outcount.pdf"
        # Ghostscript command to split the PDF
        gs -q -sDEVICE=pdfwrite -dNOPAUSE -dBATCH -dNOSAFER -r300 -dFirstPage=$first_page -dLastPage=$last_page -sOutputFile="$output_file" "$pdf_file"
        ((outcount++))
    done

done

convert -density 300 <pdf> -quality 100 "$tmpdir"/page-%02d.jpg

tesseract --dpi 300 -c thresholding_method=0 <image> stdout --psm 0

# use all three thresholding methods to try to detect a rotation.
local tess0=$(tesseract --dpi 300 -c thresholding_method=0 $page_path stdout --psm 0 2>>/dev/null)
local con0=$(echo "$tess0" | grep "Orientation confidence:" | awk '{print $3}')
local rot0=$(echo "$tess0" | grep "Rotate:" | awk '{print $2}')
local tess1=$(tesseract --dpi 300 -c thresholding_method=1 $page_path stdout --psm 0 2>>/dev/null)
local con1=$(echo "$tess1" | grep "Orientation confidence:" | awk '{print $3}')
local rot1=$(echo "$tess1" | grep "Rotate:" | awk '{print $2}')
local tess2=$(tesseract --dpi 300 -c thresholding_method=2 $page_path stdout --psm 0 2>>/dev/null)
local con2=$(echo "$tess2" | grep "Orientation confidence:" | awk '{print $3}')
local rot2=$(echo "$tess2" | grep "Rotate:" | awk '{print $2}')

# if the confidence is above 3, count it as a valid vote for a rotation
votes=()
if [ $(echo "$con0 > 3" | bc) -eq 1 ]; then
    votes+=("$rot0")
else
    echo "method 0 confidence $con0 too low"
fi
if [ $(echo "$con1 > 3" | bc) -eq 1 ]; then
    votes+=("$rot1")
else
    echo "method 1 confidence $con1 too low"
fi
if [ $(echo "$con2 > 3" | bc) -eq 1 ]; then
    votes+=("$rot2")
else
    echo "method 2 confidence $con2 too low"
fi

# tally up the rotations into buckets
cnt0=0
cnt90=0
cnt180=0
cnt270=0
for vote in "${votes[@]}"; do
    if [ "$vote" == 0 ]; then
        ((cnt0++))
    elif [ "$vote" == 90 ]; then
        ((cnt90++))
    elif [ "$vote" == 180 ]; then
        ((cnt180++))
    elif [ "$vote" == 270 ]; then
        ((cnt270++))
    fi
done

# This yields whatever rotation was voted for the most, breaking ties away from 0
local rot=0
local max="$cnt0"
if [ "$cnt90" -ge "$max" ]; then
    local rot=90
    local max="$cnt90"
fi
if [ "$cnt180" -ge "$max" ]; then
    local rot=180
    local max="$cnt180"
fi
if [ "$cnt270" -ge "$max" ]; then
    local rot=270
    local max="$cnt270"
fi

Use the recipe in the images to fill this JSON template. Produce only JSON. Convert non-ascii characters to their nearest ascii equivalents.
{
    "name": "Recipe Name",
    "totalTime": "... mins",
    "calories": ...,
    "ingredients": [
        {
            "name": "ingredient 1",
            "2-person quantity": "...",
            "4-person quantity": "...",
        },
        {
            "name": "ingredient 2",
            "2-person quantity": "...",
            "4-person quantity": "...",
        }
    ]
    "instructions": [
        "step 1",
        "step 2",
        "..."
    ],
    "notes": [
        "note 1",
        "note 2"
    ]
}

{
    "name": "Apricot, Almond & Chickpea Tagine with Zucchini, Basmati Rice & Chermoula",
    "totalTime": "40 mins",
    "calories": 950,
    "ingredients": [
        {
            "name": "Yellow Onion",
            "2-person quantity": "1/2",
            "4-person quantity": "1"
        },
        {
            "name": "Garlic",
            "2-person quantity": "1 clove",
            "4-person quantity": "2 cloves"
        },
        {
            "name": "Jalapeno",
            "2-person quantity": "1",
            "4-person quantity": "1"
        },
        {
            "name": "Zucchini",
            "2-person quantity": "1/2",
            "4-person quantity": "1"
        },
        {
            "name": "Chickpeas",
            "2-person quantity": "13.4 oz",
            "4-person quantity": "26.8 oz"
        },
        {
            "name": "Vegetable Stock Concentrates",
            "2-person quantity": "2",
            "4-person quantity": "4"
        },
        {
            "name": "Sour Cream",
            "2-person quantity": "4 TBSP",
            "4-person quantity": "8 TBSP"
        },
        {
            "name": "Basmati Rice",
            "2-person quantity": "1/2 cup",
            "4-person quantity": "1 cup"
        },
        {
            "name": "Tunisian Spice Blend",
            "2-person quantity": "1 TBSP",
            "4-person quantity": "2 TBSP"
        },
        {
            "name": "Cilantro",
            "2-person quantity": "1/4 oz",
            "4-person quantity": "1/2 oz"
        },
        {
            "name": "Lemon",
            "2-person quantity": "1",
            "4-person quantity": "2"
        },
        {
            "name": "Sliced Almonds",
            "2-person quantity": "1/2 oz",
            "4-person quantity": "1 oz"
        },
        {
            "name": "Dried Apricots",
            "2-person quantity": "1 oz",
            "4-person quantity": "2 oz"
        },
        {
            "name": "Hot Sauce",
            "2-person quantity": "1 tsp",
            "4-person quantity": "1 tsp"
        }
    ],
    "instructions": [
        "Wash and dry all produce. Halve, peel, and dice onion. Mince garlic. Zest and halve lemon. Mince jalapeno, removing ribs and seeds for less heat. Trim and halve zucchini lengthwise; cut crosswise into 1/2-inch-thick half-moons. Drain and rinse chickpeas; pat dry with paper towels.",
        "Heat a drizzle of olive oil in a small pot over medium-high heat. Add 1/4 of the onion; cook, stirring, until just softened, 2-3 minutes. Stir in rice, 3/4 cup water (1 1/2 cups for 4 servings), half the stock concentrates (you'll use the rest later), and a pinch of salt. Bring to a boil, then cover and reduce to a low simmer. Cook until rice is tender, 15-18 minutes. Keep covered off heat until ready to serve.",
        "While rice cooks, in a small bowl, combine cilantro, 2 TBSP olive oil (3 TBSP for 4 servings), a pinch of garlic, salt, and pepper. Add lemon juice to taste and add more garlic if desired. In a separate small bowl, combine sour cream, a pinch of salt, and as much lemon zest as you like. Add water 1 tsp at a time until mixture reaches a drizzling consistency.",
        "Heat a large drizzle of olive oil in a large pan over medium-high heat. Add zucchini and remaining onion. Cook, stirring, until softened and lightly browned, 5-7 minutes (7-10 minutes for 4 servings). Stir in chickpeas and remaining stock concentrates. Keep cooking, stirring frequently, until chickpeas are browned and veggies are tender, 1-2 minutes.",
        "Pour 1/3 cup water (2/3 cup for 4 servings) and remaining stock concentrates into pan. Stir in Tunisian spice. Bring to a low simmer. Cook until liquid is slightly reduced, 1-2 minutes. Reduce heat to low; stir in 1 TBSP butter (2 TBSP for 4 serving). Season with salt and pepper.",
        "Fluff rice with a fork; stir in 1 TBSP butter (2 TBSP for 4 servings). Season with salt and pepper. Divide rice between plates and top with tagine, almonds, and apricots. (TIP: Toast almonds before adding if you like). Drizzle with creamy lemon sauce and chermoula. Drizzle hot sauce if desired. Cut any remaining lemon into wedges; serve on the side."
    ],
    "notes": [
        "The tip to fluff rice right before serving using a fork helps make the grain airy and light for tender results.",
        "The Tunisian spice blend could contain a mix of spices like coriander, cumin, caraway, and garlic commonly found in North African cuisine."
    ]
}